North Eastern Regional Power Committee MINUTES OF THE … OCC Minutes... · 2019-02-01 · Minutes...

North Eastern Regional Power Committee

MINUTES OF THE 118th OPERATION COORDINATION SUB-COMMITTEE MEETING OF NERPC

Date : 11/02/2016 (Thursday)

Time : 10:00 hrs

Venue : “Hotel Nandan”, Guwahati.

The List of Participants in the 118th OCC Meeting is attached at Annexure – I

Shri P.K. Mishra, Member Secretary, NERPC welcomed all the participants to the 118th

OCC meeting. He highlighted about the outcome of the 16th TCC/RPC meetings and

intimated that some of the important resolutions adopted in the forum would be sent

shortly to Ministry of Power/Petroleum for the benefit of NER. He once again noted the

absence of members of P&E Dept. Mizoram & Tripura and mentioned that in-spite of

assurance in the NERPC meeting, the same was not adhered to and mentioned that

NERPC will take up the matter seriously with competent authorities of these

constituents. He then requested all the members to actively participate in the meeting.

Thereafter, Member Secretary requested Shri B. Lyngkhoi, Director/SE(O)to take up

the agenda items for discussion.

CONFIRMATION OF MINUTES OF 117th MEETING OF OPERATION SUB-COMMITTEE OF NERPC.

SE (O) informed that minutes of 117th meeting of Operation Sub-committee held on

07th January, 2016 at Guwahati were circulated vide letter No. NERPC/SE

(O)/OCC/2015/4556-4591 dated 15th January, 2016.

OTPC requested Operation sub-committee to amend deliberation of the sub-committee

of the Item Nos. D.3, D.11 & D.18 of 117th OCC meeting and to incorporate views of

OTPC as below:-

Item No D.3 “Furnishing Reactive Power Absorption Data for last one year”:

A. C O N F I R M A T I O N O F M I N U T E S

Minutes of 118th OCC meeting held on 11th February, 2016 at Guwahati

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Recorded:

DGM (SO-II), NERLDC requested all generating utilities of NER to furnish at least

hourly unit-wise active power in MW, reactive power in MVAR & terminal voltage in kV

of the previous month by 10th of the month as per format at Annexure –D.3

The Sub-Committee requested all generating utilities of NER to furnish the data of

previous month to NERLDC/NERPC on monthly basis by 10th of the month.

Amendment to be Recorded:

During 116th OCC, DGM, OTPC informed that they have submitted the required data

as per the prescribed format of NERDC. Further, he informed that the format is not

capturing all relevant parameters. OTPC suggested to submit detailed data printout

(automatically generated from the system) in 117th OCC for review and finalizing the

format.

During 117th OCCM, OTPC submitted the sample data in format of 15 minutes

average and hourly average comprising GT-MW, GT-MVAR, ST-MW, ST-MVAR, Grid

Frequency and 400 KV Bus Voltage.

The format for furnishing Reactive Power Absorption data by generators of NER Grid

was circulated by NERLDC alongwith minutes of 117th OCCM of NER, with generator

terminal voltage included in the format.

Item No D.11 “400kV, 80 MVAR Bus Reactor at OTPC Pallatana”:

Recorded:

DGM(O&M), OTPC informed the forum that OTPC would apply to NERLDC for

necessary charging instruction since all other formalities have been completed.

DGM (SO-II), NERLDC informed that application of charging of new element is to be

furnished to NERLDC as per format of Procedure for Integration of New Transmission

Element into the Grid.


Necessary clearances (Hard Copies) are being forwarded to NERPC for review and

approval. NERPC also informed OTPC to get CTU clearance for charging the bus

reactor. OTPC will write a letter to CTU for necessary clearance.


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Item No D.18 “Consent for URS Scheduling”: Recorded:

Honourable CERC order dated 05.10.2015 against Petition No. 310/MP/2014,

regarding scheduling Un-requisitioned Power of Sasan Ultra Mega Power Project and

direction to Load Despatch Centres to schedule Un-requisitioned Power was

discussed.

As per the order consent of the original beneficiary and the new beneficiary shall be

submitted by the ISGS intending to avail revision of schedule to the concerned RLDC

by mail.

After detailed deliberation, it was agreed that all beneficiary going for under-

requisition can give month wise standing consent to the respective ISGS (AGBPP,

AGTPP & OTPC) with a copy to NERLDC for rescheduling the URS power to the other

beneficiaries for reducing the time taken for implementing the schedule.

The forum also requested NEEPCO that it may please operate NEEPCO control room

24x7.


Matter was discussed and constituents agreed to adopt better system.

With the above Amendment(s), the Sub-committee may confirm the minutes of 117th OCCM of NERPC as no other comments/observations were received from the constituents.

I T E M S F O R D I S C U S S I O N

B. OPERATIONAL PERFORMANCE AND GRID DISCIPLINE DURING JANUARY, 2016

As per the data made available by NERLDC, the grid performance parameters for

January, 2016 are given below:


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NER PERFORMANCE DURING JANUARY, 2016

Energy Met (MU) w.r.t. Dec,15

% inc (+) /dec (-)

Energy Reqr. (MU) w.r.t.

Dec,15 % inc (+)

/dec (-)

% inc (+) /dec (-) of

energy reqr vs met. In

Jan, 16

States Jan-16 Dec-15 Jan-16 Dec-15

Ar. Pradesh 59.6 54.16 10.04 60.7 55.78 8.82 -1.85

Assam 669.1 643.05 4.05 682.5 655.70 4.09 -2.00 Manipur 77.8 74.49 4.44 79.5 75.66 5.08 -2.19

Meghalaya 166.6 157.91 5.50 184.8 167.42 10.38 -10.92 Mizoram 44.9 42.11 6.63 46.0 43.14 6.63 -2.45 Nagaland 65.2 62.42 4.45 66.6 63.67 4.60 -2.15 Tripura 52.3 77.43 -32.46 53.3 78.85 -32.40 -1.91 Region 1135.4 1111.58 2.14 1173.3 1140.21 2.90 -3.34

Demand Met (MW) w.r.t. Dec,15

% inc (+) /dec (-)

Demand in (MW) w.r.t.

Dec,15 % inc (+)

/dec (-)

% inc (+) /dec (-) of Demand vs

met. In Jan, 16

States Jan-16 Dec-15 Jan-16 Dec-15

Ar. Pradesh 116.8 132 -11.52 117.6 133 -11.58 -0.68

Assam 1330.0 1314 1.22 1338.6 1312 2.03 -0.65 Manipur 166.0 167 -0.60 168.1 167 0.66 -1.27

Meghalaya 377.0 348 8.33 377.8 349 8.25 -0.21 Mizoram 101.0 96 5.21 102.4 97 5.57 -1.39 Nagaland 122.0 138 -11.59 122.3 140 -12.64 -0.25 Tripura 220.0 221 -0.45 219.1 221 -0.86 0.41 Region 2331.7 2320 0.50 2367.3 2355 0.52 -1.53

REGIONAL GENERATION & INTER-REGIONAL EXCHANGE IN MU

AVERAGE FREQUENCY (Hz)

Month----> Jan-16 Dec-15

Month----> Jan-16 Dec-15

Total Generation in NER (Gross) 898.40 924.69

% of Time

% of Time

Total Central Sector Generation (Gross) 649.80 662.96

Below 49.9 Hz 9.19 16.23

Total State Sector Generation (Gross) 248.60 261.73

Between 49.9 to 50.05 Hz 67.96 66.32

Inter-Regional Energy Exchange

Above 50.05 Hz 22.85 17.45

(a) NER-ER 228.50 90.66

Average 50.00 49.98 (b) ER-NER 421.80 17.34

Maximum 50.39 50.32 (c)NER-NR 201.50 0.00 (d)NR-NER 91.60 333.85 © Net Import 83.40 260.53

Minimum 49.70 49.59

The Sub-committee noted as above.


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FOLLOW UP ACTION

C.1 Status of Generating Units, Transmission Lines in NER:

During 118th OCC meeting, the status as informed by NTPC, NEEPCO, POWERGRID

and DOP, Nagaland is as follows:

SN Items Status as given in 118th OCC Meeting

Status as on 117th OCC

1

Trial operation and CoD of Unit -I of Bongaigoan TPS of NTPC

Same as 117th OCC Status

Unit #1 by March, 2016 First infirm injection in January, 2016. NERLDC requested NTPC to furnish quantum of block-wise infirm injection in MW on day ahead basis

2

400/220kV, 2x315 MVA ICT of NTPC at Bongaigaon

31.03.2016.

31.03.2016

3

Trial operation and CoD of Monarchak GBPP of NEEPCO

Same as 117th OCC Status Trial run of STG not done COD on 31.03.2016

4

Kameng HEP of NEEPCO two units (2 x 150 MW)

Next two units (2x150 MW)

November, 2016 March, 2017

November, 2016 March, 2017

5

Pare HEP of NEEPCO (2 x 55 MW)

March, 2017 June, 2016

6

400 kV D/C Silchar - Melriat line of PGCIL

September, 2016 Retendering done. September, 2016

7

220kV Rangia - Salakati of AEGCL

June, 2016 June, 2016. 4 Piles out of 13 Piles completed.

8

132kV Monarchak – Surjamaninagar D/C of TSECL

No representative No representative

9

400/132 kV, 2nd 125 MVA ICT at Pallatana

June, 2016 June, 2016

10

132kV Pasighat – Aalong of Ar. Pradesh

No representative March, 2016

11

132kV Doyang– Wokha

No representative

February, 2016


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12

220 kV, 20 MVAR Bus Reactor at AGBPP

March, 2016 February, 2016

13

132kV Surjamaninagar Bay at OTPC

June, 2016 June, 2016

14

63MVAR Reactor at Byrnihat of Me.PTCL

SE, SLDC informed he will inform the status to NERPC soon

SE, SLDC informed that Estimated Cost approval from Board is awaited. The status will be intimated in next OCC meeting.

15 Up-gradation of 132 kV Lumshnong-Panchgram line

Assam will furnish the DPR to Meghalaya by February, 2016

DPR preparation stage

16 Biswanath Chariali 80 MVAR Bus Reactor

Ready for charging apply for shutdown

January,2016

17 RHEP 80 MVAR Bus Reactor

The DPR was furnished by NEEPCO and matter was referred to next SCM of CEA.

The status will be intimated in next OCC meeting.

18

Switchable line Reactors at 400kV Balipara & Bongaigoan

March 2016 March 2016

19

PLCC Panels at Loktak end of Loktak – Ningthoukhong 132 kV feeder and Loktak - Rengpang 132 kV feeder

March 2016 March 2016

20

400kV D/C Balipara – Kameng of Ar. Pradesh

No representative

-

21

LILO of 132kV Ranganadi – Nirjuli at Pare of NEEPCO

22

LILO of 132kV Ranganadi – Itanagar (Chimpu) at Pare of NEEPCO

23

LILO of 132kV Jiribam – Aizawl at Tuirial of DoP, Mizoram/NEEPCO


Action: All concerned Utilities above.


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C.2 CT Ratio of Transmission Lines & Enhancement of Loadability of lines in NER:

During 117th OCC meeting, NERTS, POWERGRID informed that 15 nos. 600/1 A CTs

will be arranged for dynamic rating of the lines listed in Annexure C.2. NERLDC

requested to other utilities to change CT for dynamic rating of the lines listed in

Annexure C.2.

Deliberation of the Sub-Committee

The latest status as informed in the 118th OCC is given in Annexure - C.2. As

indicated by DGM, NERTS, procurement of 21 nos. CTs for all lines up-gradation of

CT ratios of NERTS, including 132 kV Doyang – Dimapur D/C, will take at least 6

months time.

The Sub-Committee noted as above.

C.3 Finalization of Operating Procedures of State Grid of NER: As per clause no 5.1.g of IEGC, detailed operating procedures for each state grid

shall be developed and maintained by the respective SLDC.

Deliberation of the sub-Committee: Status as intimated during 118th OCC forum of NERPC is as follow:-

Sl No Description Status of approval from

OCC forum of NERPC 1 Operating Procedure of Ar. Pradesh 2015 Not submitted 2 Operating Procedure of Assam 2015 Submitted 3 Operating Procedure of Manipur 2015 By 31.03.2016 4 Operating Procedure of Meghalaya 2015 Submitted 5 Operating Procedure of Mizoram 2015 By 31.03.2016 6 Operating Procedure of Nagaland 2015 By 31.03.2016 7 Operating Procedure of Tripura 2015 Not submitted

SLDC, Meghalaya informed that Draft Operating Procedure had been submitted by

them and is expected to be finalized soon. The forum requested SLDC, Meghalaya to

finalize the operating Procedure of Meghalaya at the earliest.

The forum also requested SLDC, Manipur to submit their operating procedure

The Sub-committee noted as above. Action: All constituents as above.


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C.4 Monthly MU requirement & availability of each state of NER as per format:

The following figures of state wise MU requirement and availability were taken from

draft LGBR 2015-16 of NERPC. State wise MU requirement and availability for these

months are to be checked. Constituents may kindly verify if the above data are

correct.

Requirement:

Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16 Ar. Pradesh 67 57 70

Assam 680 650 700 Manipur 80 70 75

Meghalaya 215 185 190 Mizoram 47 40 45 Nagaland 65 65 70 Tripura 125 100 125

NER 1279 1167 1275

Availability: Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16

Ar. Pradesh 48 40 50 Assam 590 550 600

Manipur 70 60 65 Meghalaya 180 145 140 Mizoram 42 40 45 Nagaland 55 50 50 Tripura 200 150 170

NER 1185 1035 1120


C.8 Monthly MW requirement & availability of each state of NER: The following figures were taken from LGBR 2015-16 of NERPC. These figures are to

be reviewed.

A. Peak Demand in MW Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16

Ar. Pradesh 133 130 135 117 117 115 Assam 1400 1260 1410 1487 1487 1495

Manipur 165 148 155 154 155 160 Meghalaya 375 350 400 279 268 248 Mizoram 90 85 90 88 88 83 Nagaland 125 120 130 175 182 195 Tripura 250 240 275 240 246 250

NER 2538 2333 2595 2540 2543 2546


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B. Peak Availability in MW

Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16 Ar. Pradesh 118 110 130

Assam 1195 1150 1170 Manipur 145 128 140

Meghalaya 325 280 250 Mizoram 85 85 80 Nagaland 95 90 95 Tripura 403/230 403/230 403/230

NER 2375 2243 2268 *Tripura indicates 400/230 if Pallatana available/if not available

B.1. Off Peak Demand in MW (08:00 Hrs)

Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16 Ar. Pradesh 73 70 80 92 92 90

Assam 1030 1020 1050 1091 1091 1194 Manipur 95 90 95 76 76 120

Meghalaya 230 220 220 193 186 185 Mizoram 60 55 55 66 66 52 Nagaland 85 75 80 116 122 139 Tripura 190 170 180 149 157 156

NER 1638 1700 1760 1783 1790 1936

B.2. Off Peak Availability in MW (08:00 Hrs) Name of State Jan16 Feb16 Mar16 Apr16 May16 Jun16

Ar. Pradesh 65 60 70 Assam 850 900 950

Manipur 90 80 85 Meghalaya 275 245 230 Mizoram 60 60 55 Nagaland 70 60 65 Tripura 240 240 240

NER 1650 1645 1695

Deliberation of the sub-Committee: SE(O), NERPC informed that since LGBR for 2016-2017 is under preparation, the

data for April, 2016 onwards will be furnished once the above LGBR is finalized.

DGM (SO-I), NERLDC stated that since data is required for first quarter i.e. till June,

2016, hence the data as prepared by NERLDC will be incorporated upto June, 2016

above till LGBR of NERPC is finalized.



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D. N E W I T E M S D.1 Generation Planning (ongoing and planned outages)

NEEPCO/NHPC may kindly intimate the availability for hydro stations:

Generating Station Units running MW MU Reservoir

Khandong 2 38 0.117 711.45

Kopili 2 96 1.512 597

Kopili-II 1 18 0.054 711.45

Ranganadi 3 401 Subject to inflow

Doyang 2 33 0.099 309.8

Loktak 3 105 0.502 767.54

AGBPP - - - -

AGTPP - - - -

Hydro planning In view of outage of Kopili units, proper planning is essential for utilization of

available water of other reservoir based stations so that adequate generation can be

maintained upto April/May, 2016.

Since water level at Loktak HEP is in comfort position, the plant will be utilized in the

peak hours during complete shutdown of Kopili HEP.

The Committee discussed and approved the proposed shutdown by Generating Stations and the same is given in Annexure – D.2 (along with trans-element). D.2 Outage Planning Transmission elements

It was agreed in the 99th OCC meeting that shutdown will be availed only after

approval is given by the OCC forum. It was also agreed that deferment/revision of

outages elements other than already approved in OCC will be henceforth

put/displayed in the website of NERPC (under Operational Activities/OCC Approved shutdown) as per CERC regulations/ CEA guidelines etc for ensuring

smooth & secure grid operation.

Furnishing request of shut down of the element, which was approved by NERPC, by Indenting Agency (ISTS licensees/STUs/Generating Companies) to NERLDC: Planned shutdown approved by NERPC shall be considered for implementation by


11

NERLDC on D-3 basis. If an outage is to be availed on say 10th of the month, the

shutdown availing agency would reconfirm to NERLDC on 7th of the month by 10:00

Hr. This practice is necessary to ensure optimal capacity utilization and the time

required for associated system study/coordination by/amongst RLDC/NLDC.

Deliberation in the meeting

The sub-Committee discussed and approved the proposals received from the constituents regarding transmission elements for February, 2016 – March, 2016 and the same has already been uploaded in website of NERPC.

D.3 Furnishing Reactive Power Absorption Data for last one year:

As per Para no. 9.9.1 of Recommendations of Enquiry Committee on Grid

Disturbance, the regulatory provisions regarding absorption of reactive power by

generating units needs to be implemented.

It is requested that you may please furnish instances when Reactive Power support

was provided by Generators for last one year.

DGM (SO-II), NERLDC requested all generating utilities of NER to furnish at least

hourly unit-wise active power in MW, reactive power in MVAR & terminal voltage in

kV of the previous month by 10th of the month as per format at Annexure –D.3.

The Sub-Committee requested all generating utilities of NER to furnish the data of

previous month to NERLDC/NERPC on monthly basis by 10th of the month.

The latest Capability Curve of each generator in Soft Copy may also be provided.

NERLDC requested NEEPCO to furnish reactive power absorption data of their

generators as per format circulated by NERLDC, centrally from NEEPCO Control

Room, Shillong, for ease of co-ordination between NERLDC and ISGS generators of

NEEPCO. NEEPCO agreed to the same.

NERLDC also requested NHPC to furnish the reactive power absorption data of

Loktak HEP as per format. NHPC agreed to start furnishing data from March 2016

onwards.

Action: NEEPCO & NHPC.


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D.4 Furnishing of Technical & Commercial Data for Computation of PoC Charges & Losses for 1st Quarter of 2016-17(April’16 – June’16):

As per provisions of the CERC (Sharing of Inter State Transmission Charges and

Losses) Regulations, 2010 as amended from time to time, the following data are

required for Computation of PoC Charges & Losses for 1st Quarter of 2016-17 (April’16- May’16)

1. Technical details of new transmission elements and generating units which are expected to commence commercial operation during April’16- May’16

2. Yearly Transmission Charges 3. Nodal Generation information and forecast withdrawl data

As per provisions of the CERC (Sharing of Inter State Transmission Charges and

Losses) (Third Amendment), Regulations, 2015, the Designated ISTS Customers

(DICs) are required to submit node-wise forecast injection/withdrawal information

and maximum injection/withdrawl data for corresponding quarter of last three years

to the Implementing Agency for computation of PoC Charges & Losses for 1st Quarter of 2016-17 (April’16- May’16).

As discussed in 4th Validation Committee Meeting following dates were finalized for

submission of data for 1st Quarter of 2016-17 (April’16- May’16)

Sl. No. Timeline Remarks 1 31st January, 2016 Data to be provided by DICs to IA 2 10th February, 2016 Data to be sent by IA to RPC

3 25th February, 2016 RPC to rectify the data through a meeting at RPC level and then send to IA by 25th February, 2016

4 30th February, 2016 Validation Committee meeting

During 116th OCC all the utilities agreed to submit the data as per formats for

Quarter 1 of 2016-17 (April- June, 2016) by 31st January, 2016.

In 117th OCC NERLDC requested DICs & transmission utilities to furnish Technical

& Commercial Data for Computation of PoC Charges & Losses for 1st Quarter of

2016-17 (Apr’16- Jun’16) as per format by 15th January, 2016.

All Utilities agreed to submit the data as per formats for Quarter 1 of 2016-17 (April-

June, 2016) by 15th January, 2016.

DGM(SO-II), NERLDC once again reiterated that necessary Forms are already

available in NLDC website and constituents may kindly download from there.


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In line with the decision in the Validation Committee meeting, Demand and

Generation projections w.r.t North Eastern Region constituents as given by

Implementing Agency is attached in Annexure D.4 for ratification in 118th OCC

Meeting of NERPC.


Members deliberated and reviewed the data as furnished by NERLDC and the same

is attached at Annexure – D.4. Figures to be discussed and modifications as follows:

a) Ranganadi => Restrict to 401 MW (Installed – Auxiliary Consumption)

b) Palatana => Due to uncertainty in gas supply, figure kept at 478 MW.

c) AGTPP => To be taken as 78 MW. And 44 MW for AGTPP Extension.

d) Meghalaya => Generation is very high (271 MW given). Meghalaya to give their

final generation figures.

f) Assam => Demand of Assam to be changed to 1250 MW. (As per comments from

AEGCL representative)

g) Kopili => Generation to be kept as 90 MW

h) Tripura => Demand to be taken as 230 MW

i) Loktak => Generation to be taken as 103 MW (As per comments from NHPC

representative).

Senior Engineer (SO-II) informed the forum that some lines owned by AEGCL,

MePTCL and TSECL have been approved by CERC for inclusion in calculation of PoC

Charges and Losses. Accordingly, YTC (Yearly Transmission Charges) information

from AEGCL, MePTCL and TSECL are required by the Implementing Agency (NLDC)

for inclusion in PoC Charges and Losses calculation for Q4 of 2015-16 and Q1 of

2016-17. He requested AEGCL, MePTCL and TSECL to furnish the requisite

information at the earliest to NLDC with a copy to NERLDC. AEGCL and MePTCL

agreed.

NERLDC also expressed the need to include generation figures of Monarchak GT-1 in

generation figures of Tripura. Due to presence of no representative from Tripura and

in absence of confirmation regarding adequate gas supply to Palatana and

Monarchak, the matter was kept for further discussion.



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D.5 Shutdown of Block- #2 of OTPC:

OTPC intimated that Pallatana Block-2 will undergo shutdown from 25th January,

2016 to 7th February, 2016 for CI & HRSG License renewal.

During 116th OCC meeting, the issue was discussed in detailed and the forum

requested OTPC to keep in mind that any maintenance schedule should not be taken

during lean hydro season. The forum requested OTPC to take up the matter with the

concerned agency so that in future no shutdown will be granted to them during lean

hydro season. The comfort period granted by the forum is July to September.

DGM, OTPC mentioned that he will take the matter with Competent Authority of

OTPC so that the solution can be finalized in this regard.

The forum however approved the above shutdown since no sufficient gas is available

to OTPC to run both the units.

Members raised the issue regarding reduction of gas supply to Pallatana and

requested NERPC to take up the matter with highest authority of ONGC.

SE(O), NERPC informed that during 27th CC meeting, the issue of reducing of gas

supply to Pallatana to accommodate Monarchak is a very serious concern for NER

beneficiaries as till now it is understood that Monarchak is a state project and he

requested the house to take up the matter in the next NERPC meeting. Further, he

stated that full gas supply should be made available to Pallatana first then to

Monarchak Plant to avoid deprivation of all other NER states.

The forum unanimously reiterated that thermal power plant (gas based & coal based)

shutdown may be taken only during the high hydro period i.e. July to September. Regarding non-availability of gas to OTPC, SE(O) requested utilities to propose this

as an agenda item for 16th TCC/RPC.

Deliberation in the meeting The forum once again reiterated that thermal power plant (gas based & coal based)

shutdown may be taken only during the high hydro period i.e. July to September.

Regarding non availability of gas, SE(O) informed that the matter had been

deliberated in detailed during 16th TCC/NERPC meeting and it was decided that till

the full quantum of gas can be supplied to all the above GBPPs, required quantum of

gas should be given to Regional project of Palatana to run both the units.



15

D.6 Early Restoration of 63 MVAR line Reactor at Balipara: The 63 MVAR line Reactor of 400 kV Bongaigaon – Balipara line –II at Balipara end is

under outage since 19.07.2015. Early restoration of the reactor is very essential for

containing over voltage problem which is very much on higher side after

commissioning of Agra- BNC HVDC pole-I especially during operation of the pole.

Presently the problem is being managed by opening 400 kV lines thereby system

security is compromised.

Early commissioning of 80 MVAR 2nd Bus reactor at BNC is also very much essential

in this connection.

During 117th OCC meeting, DGM (AM), NERTS informed the forum that EI of RIO

(NE) will inspect on 12.01.16 and then reactor would be commissioned once the

clearance is obtained.

Deliberation in the meeting DGM (AM), NERTS informed the forum that the above restoration will be completed

by February, 2016.


D.7 Estimated Transmission Availability Certificate (TAC) for the month of December, 2015.

NETC and POWERGRID, NERTS have submitted TAC data of December, 2015 in the

first/second week of January, 2016. This will enable issuance of verification by

NERLDC and certification by NERPC on monthly basis within stipulated time frame.

Both NETC and NERTS are advised to follow the agreed time schedule in future to

avoid accumulation of reports and corresponding delay.


D.8 400kV, 80 MVAR Bus Reactor at OTPC Pallatana

During the 117th OCC Meeting, OTPC informed that the 400kV, 80 MVAR Bus

Reactor at OTPC Pallatana is ready for recharging and sought clearance for charging

of the same. NERLDC informed that the same can be taken into service subject to

real time condition.


16

However, now after checking the relevant records at NERLDC it is seen that the

reactor was never successfully put into service and the matter has to be look into

considering that the element was out for a prolong period.

In this connection it is pertinent to mention that, as per Clause No. 43 of Measures

Relating to Safety & Electric Supply Regulation 2010 by CEA, the electrical

installations/line, before commencement of supply or recommencement after

shutdown for six months and above shall not be charged/ energized without the

approval of the Electrical Inspector in writing to ensure safety measures specified

under the said regulations in the electrical installations.

OTPC may take action accordingly and certify fulfillment of other statutory

requirements while permission for charging the reactor is sought.

DGM(O&M), OTPC informed the forum that OTPC would apply to NERLDC for

necessary charging instruction since all other formalities have been completed.

DGM (SO-II), NERLDC informed that application of charging of new element is to be

furnished to NERLDC as per format of Procedure for Integration of New Transmission

Element into the Grid.


NERLDC informed that charging clearance for the reactor will be issued once OTPC

applies for the same and requested OTPC to bring the reactor into service to address

the persistent high voltage problem at Palatana 400 kV bus.


Action: OTPC/NERLDC.

D.9 Modification of existing 132kV S/C Nirjuli –Ranganadi Transmission Line

on account of Railway Track Construction:

The newly constructed Harmuti-Naharlagun Railway Track infringes with the 132KV

Nirjuli-Ranganadi line between existing location 02 to loc.14 & crosses the track at 3

(three) locations. In order to do away with this infringement & at the behest of the

District Administration, POWERGRID has carried out detailed survey for re-

alignment of the complete line section from loc.134 to loc.23. The proposed line

section shall now pass through Emchinallah-Lekhi village in Papumpare District.


17

Further, the contract for diversion of the line section from loc.134 to loc.23 has also

been awarded by POWERGRID & erection work is expected for commencement very

shortly. Subsequent to completion of the re-aligned section of the line(which is

expected by April’2016), the existing line section passing through Doimukh area in

Papumpare District shall be required to be disconnected & dismantled. It may be

mentioned that the 132KV Nirjuli-Ranganadi line has been looped in & looped out at

132KV Lekhi Substation of DoP, AP at tower loc.11. Therefore, with disconnection of

the existing line section from loc.134 to loc.23 as a result of its re-alignment,

connection of Lekhi Substation(DoP, AP) with Ranganadi & Nirjuli through the LILO

portion shall be no longer available.

It is learnt that action has been taken by DoP, AP simultaneously for modification of

the LILO line so as to ensure connectivity with 132KV Nirjuli-Ranganadi line after re-

alignment is carried out by POWERGRID. Therefore, DoP, AP may look into for

completion of this modification of LILO portion of the line matching with re-

alignment of the line from loc.134 to loc.23( under execution by POWERGRID) in

case it is felt necessary to maintain the existing configuration of LILO of line at Lekhi

S/s(DoP, AP).

During 116th OCC meeting, the Sub-committee unanimously agreed to the proposal

of NERTS.

During 117th OCC, DGM (AM), NERTS informed the forum that erection works

related to Ar. Pradesh i.e. LILO point for connectivity to Lekhi should match that of

POWERGRID.

EE, SLDC, Ar. Pradesh informed the forum that Railways have not yet transferred

the funds to DoP, Ar. Pradesh. He assured to take up the matter with their

concerned authority to match the construction.

DGM(AM), NERTS informed the forum that erection works related to Ar. Pradesh i.e.

LILO point for connectivity to Lekhi should match that of POWERGRID.

EE, SLDC, Ar. Pradesh informed the forum that Railways have not yet transferred

the funds to DoP, Ar. Pradesh. He requested that the matter may be referred to next

TCC/RPC meeting keeping in mind the sensitivity of the issue.

The Sub-committee instructed that DoP, Ar. Pradesh should carry out the above

work in line with PPOWERGRID so that the power supply to Nirjuli does not hamper.


18

Deliberation in the meeting Since no representative from Ar. Pradesh was present, portion pertaining to Ar.

Pradesh could not be updated.

Action: NERTS & Ar. Pradesh.

D.10 Assessment of Total Transfer Capability (TTC), Transmission Reliability

Margin (TRM) and Available Transfer Capability (ATC) by SLDC on respective Inter-State Transmission Corridor

SLDCs of NER are requested to assess the above on monthly basis, 5 months in

advance (eg: TTC/TRM/ATC for the month of November to be calculated by 15th of

July), for further assessment of TTC, ATC and TRM of NER–ER corridor, group of

control areas, individual control areas with the region and state-control-area to state-

control-area by NERLDC, if required.

SLDCs are also requested to send study results for Peak (Export & Import) & Off

Peak (Export & Import) along with assumptions in details and 6 nos “.sav” case files

(Base Case for Peak & Off Peak, Off Peak & Peak Export & Off Peak & Peak Import) to

NERLDC by 15th of the month for the fifth month. All India “.sav” case files have

been sent to SLDCs. SLDCs are requested to use this “.sav” case files while

computing TTC, ATC & TRM for their state control area.

As decided in 4th Meeting of NPC held on 10.12.2015, monthly TTC/ATC figures are to be uploaded by SLDCs at their respective website and also communicate the same to respective RLDC & NLDC subsequently.

The study results for assessment of Total Transfer Capability (TTC), Transmission Reliability Margin (TRM) and Available Transfer Capability (ATC) have not been received from any SLDC of NER. Updated Base Cases have been already mailed to all the SLDCs on 08.02.16. All the SLDCs are requested to assess the Total Transfer Capability (TTC), Transmission Reliability Margin (TRM) and Available Transfer Capability (ATC) and submit the cases to NERLDC for the month of June’16 by 15th February, 2016.

The state-wise Transfer Capability as assessed by NERLDC for the month of Jun’16 based on available information is as below.

Import Capability.


19

SN State

Off Peak Case Peak Case

Contingency Total

Transfer Capability

Contingency Total

Transfer Capability

1 Ar. Pradesh

N-1 of 132/33 kV, 1x20 MVA

Transformer at Naharlagun

165 N-1 of 132/33 kV,

1x20 MVA Transformer at Naharlagun

165

2 Assam

N-1 of 220/132 kV, 3x100 MVA transformers at

Sarusajai

1410

N-1 of 220/132 kV, 3x100 MVA

transformers at Sarusajai

1370

3 Manipur

N-1 of 132/33 kV, 2x50 MVA

Transformers at Imphal (PG)

285

N-1 of 132/33 kV, 2x50 MVA

Transformers at Imphal (PG)

285

4 Meghalaya N-1 of 132 kV Killing-Epip II D/C 270 N-1 of 132 kV Killing-

Epip II D/C 275

5 Mizoram

N-1 of 132/33kV, 12.5 MVA

transformer at Luangmual/Zimabawk/Serchip/Lun

glei

110

N-1 of 132/33kV, 12.5 MVA transformer at

Luangmual/Zimabawk/Serchip/Lunglei

110

6 Nagaland

N-1 of 132/66 kV, 100 MVA ICT at

Dimapur (Nagaland)

95 N-1 of 132/66 kV, 100 MVA ICT at Dimapur

(Nagaland) 95

7 Tripura N-1 of 132 kV

Palatana - Udaipur S/C

190 N-1 of 132 kV Palatana - Udaipur S/C 150

States are requested to check the TTC of their control areas as computed by NERLDC and issue comments, if any by 20th February, 2016. If no comments received from any states TTC, ATC & TRM figures of States control area and group of control areas will be finalized and may be uploaded in NLDC website, if required. Deliberation in the meeting DGM(SO-I), NERLDC requested all utilities to kindly verify the ATC/TTC figures. The

figures for state-wise TTC as above, would be considered as Final if no comments are

received from any SLDCs of NER by 20.02.2016.

NERLDC re-iterated that as decided in 4th Meeting of NPC held on 10.12.2015,

monthly TTC/ATC figures are to be uploaded by SLDCs at their respective website

and also communicate the same to respective RLDC & NLDC subsequently.


20

Accordingly SLDCs were requested to host the TTC/ATC figures circulated by

NERLDC on their respective website. The same was agreed by them.

After detailed deliberation it was decided to refer the issue related to system studies

by SLDCs to System Study sub-group meeting.

The Sub-Committee requested constituents to send their consent officers who are involved in the above study to NERLDC Shillong so that necessary training and assistance can be given to them for acquaintances of the study.

D.11 Implementation of Automatic Demand Management Scheme (ADMS)

Hon’ble CERC directed vide order in Petition No. 113/MP/2014 on 31.12.15 to

submit PERT charts & action plans for Implementation of Automatic Demand

Management Scheme (ADMS) by SLDCs of NER and to implement ADMS by

30.06.16. Hon’ble CERC directed RLDCs to submit the report of status of

implementation of Automatic Demand Management Scheme (ADMS) by SLDCs of

NER by 31.08.16.

SLDCs of NER are requested to furnish monthly report of status of implementation of

Automatic Demand Management Scheme (ADMS) by SLDCs of NER.

During 117th OCC meeting, AGM, SLDC, Assam suggested that since ADMS involves

connectivity to 33kV substations, a separate meeting with the DISCOMS is required.

The forum agreed and requested NERPC to kindly convene the meeting at a suitable

date.

NERLDC requested SLDCs of NER to submit the report of status of implementation of

Automatic Demand Management Scheme (ADMS) by SLDCs of NER by 15.08.16.


SE(O) informed that during the recent workshop on RTUs, some of the firms have

intimated that they can help the NER constituents related to implementation of

Automatic Demand Management Scheme (ADMS) by giving some presentation on the

issue.

The Sub-committee requested NERPC to conduct a workshop/seminar on ADMS by calling some of the reputed firms viz. ABB, ALSTOM, WIZIMAX, SCHENIDER etc. and also to request all the DISCOMs (dealing with R-APRDP), SLDCs for the benefit of the constituents.


21

The SLDCs of NER agreed to submit the report of status of implementation of ADMS

to NERLDC by 15.08.2016.

Action: SLDCs & NERPC.

D.12 Consent for URS Scheduling:

At present URS of any ISGS is being scheduled to other beneficiaries after taking

consent of the concerned ISGS. This is creating delay in scheduling process. A

standing consent from the ISGS station can help in this respect.

The 117th OCC forum deliberated upon Honourable CERC order dated 05.10.2015

against Petition No. 310/MP/2014, regarding scheduling Un-requisitioned Power of

Sasan Ultra Mega Power Project and direction to Load Despatch Centres to schedule

Un-requisitioned Power was discussed.

As per the order consent of the original beneficiary and the new beneficiary shall be

submitted by the ISGS intending to avail revision of schedule to the concerned RLDC

by mail.

After detailed deliberation, it was agreed that all beneficiary going for under-

requisition can give month wise standing consent to the respective ISGS (AGBPP,

AGTPP & OTPC) with a copy to NERLDC for rescheduling the URS power to the other

beneficiaries for reducing the time taken for implementing the schedule.

The forum also requested NEEPCO that it may please operate NEEPCO control room 24x7.

Deliberation in the meeting After detail discussion it was decided-

1. All beneficiaries going for under requisition will give month wise standing consent

to the respective ISGS (AGBPP, AGTPP & OTPC) with a copy to NERLDC for

rescheduling the URS power to the other beneficiaries.

2. All URS power scheduling request by the beneficiary shall be applied to concern

ISGS. After receiving the URS power scheduling request from the beneficiaries,

the respective ISGS may give URS scheduling request to NERLDC.

3. ISGS (AGBPP,AGTPP,Palatan) will identify one coordinator for URS power

scheduling related coordination with the beneficiaries for smooth and timely

implementation.


22

4. After receiving the request from concern ISGS for scheduling of URS power,

NERLDC shall implement the same after due consideration of Ramp up/Ramp

down and technical minimum of plant.

The Sub-committee noted as above. Action: All concerned utilities. D.13 Rectification of phase notations in NER grid:

It has been found that PMUs are showing different phasors w.r.t different nodes of

same grid. It is suspected that there are change in phase notations in NER grid &

connectivity.

During 1st NETeST meeting, the forum advised that mixing of Phases (change in

phase reference w.r.t. one utility is sometimes different from another) as reflected by

PMU data in regional grid is to be corrected. Forum requested that the same may be

taken up OCC forum of NERPC.

Deliberation in the meeting DGM, NERTS informed that the problem is at Agartala end and the same will be

rectified soon.

NERLDC informed that due to mismatch in phase notations, angles reported by

PMUs are erroneous and Agartala PMU was reporting wrong at the time of the OCC

meeting. Also, due to mismatch in phase markings in some places like 400 kV Azara,

DR prints received from two ends of the 400 kV lines from Azara showed mismatch in

phases. AEGCL was requested to take up correction in phase notations at the

earliest.


Action: NERTS.

D.14 Allocation for share from ISGS towards Auxiliary Energy Consumption for

± 800kV HVDC Biswanath Chariali Substation of POWERGRID:

"CEA vide its letter No. 7/X/VIP(ER)/GM-2016/214 dtd. 01/02/2016 has stated that

in other regions specific allocation of power is made from NTPC station's unallocated

power from HVDC stations of POWERGRID. Since, NER does not have any coal based

thermal station, the 2.5 MW specific allocation can be allocated from unallocated quota

of any gas based NEEPCO station or any upcoming coal based station of NER. "


23

In this regard it may be noted that there is no unallocated quota from any gas based

station in NER. OTPC has 13.498623% Merchant Power share from Palatana GBPP.

The allocation of power from Bongaigaon TPS of NTPC is as follows:

Name of Beneficiary Share Allocation (%)

Ar. Pradesh 4.93

Assam 50.80

Manipur 6.27

Meghalaya 7.07

Mizoram 4.13

Nagaland 4.27

Tripura 7.47

Unallocated 15.06

Total 100.00


After detailed deliberation, the Sub-committee agreed that 2.5MW power allocation to BNC Sub-station should be made available from coming Bongaigoan TPP. The Sub-committee requested NERPC to take the matter with MoP accordingly.

Action: NERPC.

D.15 Transformer Tap optimization

System study was conducted by NERLDC considering load, generation and network

pattern of February, 2015 during Peak & Off Peak periods. Suggested taps position of

important transformers in NER for maintaining bus voltages within permissible limit

as well as to minimize system losses are attached at Annexure –D.15.

Deliberation in the meeting NERLDC circulated the results of tap-optimisation study for discussion. NERLDC

also circulated the scatter plots at 400/220 kV Bongaigaon (PG), 400/220 kV

Balipara (PG), 400/220 kV Misa (PG), 400/132 kV Ranganadi (NEEPCO), 400/132


24

kV Silchar (PG) and 400/132 kV Palatana (OTPC) to depict the pattern of voltages for

the months of October 2015 – January 2016, to aid in tap optimization. It was

iterated that due to non-availability of correct data in SCADA system from 400/220

kV Azara, 400/220 kV Byrnihat, 132 kV Biswanath Chariali (PG), scatter plots could

not be developed for these substations. NERLDC requested to ensure proper data

from all 400 kV substations, considering their importance.

After detailed deliberation, the Sub-committee suggested that transformer tap position can be tested at Byrnihat sub-station first and the outcome can be monitored by NERLDC if the voltage will improve.

Action: NERLDC.

D.16 Rescheduling of Seminar on “Restoration procedure”

Like previous years this year also NERLDC will organize one day seminar on

“Restoration Procedure of NER Grid”. It was proposed to organize the seminar in

February’16. Now the same is rescheduled to March’16, the exact date & venue will

be intimated later. We have received some nominations from some utilities. All the

other Utilities are requested to please nominate 4/5 or more number of participants

associated with operation of SLDCs, Generating stations and Sub-stations for the

purpose.


DGM(SO-I), NERLDC informed that the above seminar will be held in March, 2016

and requested all the constituents to send the nominations at the earliest. The exact

date and venue will be intimated shortly.


Action: NERLDC.

D.17 Restoration of 220/132 kV, 30 MVA ICT-I of Mokokchung

The 220/132 kV, 30 MVA ICT-I of Mokokchung is under outage since 18.10.2015 as

a result of which the other ICT is getting overloaded and it is not possible to run the

system in closed loop. Moreover it is also difficult to keep the 220 kV lines in charged

condition due to over voltage problem. To avoid these problems 220 kV Mariani(New)

– Mokokchung ckt-I& II are being kept in open condition most of the time and

Mokokchung is radially fed from Doyang. Early restoration of the ICT-I is urgently

required.


25


DGM(AM), NERTS informed that the work is in progress and the ICT-I will be restored

within February, 2016.


Action: NERTS.

D.18 CERC Order on Petition no. 007/SM/2014

Hon’ble CERC has issued order against Petition no. 007/SM/2014 on 29.01.15 [Suo

Motto]. Gist of the above order is as follows:

a. PGCIL to undertake effective monitoring of telemeter data and to minimize the

intermittency in telemetry in all regions within six months from the issue of

the order. NLDC is directed to submit status of PGCIL`s telemetry within one

month thereafter.

b. All the utilities/generating companies which have to still establish telemeter

power system parameters as per details given in para11 of the Order to provide

data to RLDCs/SLDCs as per the provisions of the Grid Code and CEA Grid

Standards Regulations by 31.7.2016.

c. Department of Power, Govt. of Arunachal Pradesh and Department of Power,

Govt. of Nagaland to up-date status of telemetry in their system within one

month of this order with an advance copy to NLDC, NERLDC and NERPC.

Based on the replies, NERLDC will monitor the implementation of telemetry

and in case of any difficulty, the matter may be discussed and sorted out in

the NERPC meetings. If any of these entities does not submit the information,

NERLDC may file application before the Commission against the said entities

under Section 142 of the Act.

d. NLDC and respective RLDC are directed to up-date the status of telemetry

every month at their web-site and persistent non-availability of data from the

generating stations/sub-stations be taken up in RPC meetings for appropriate

direction and action.

e. NLDC is directed to submit user- wise latest status of telemetry, by 31.8.2016.


26


Members felt the important of putting in place the telemetry system for benefit of

system operation, the forum requested to take up the matter in next TeST meeting of

NERPC.


Action: NERPC. D.19 Furnishing of Variable & Fixed Cost of Generating stations

SLDCs & ISGS of NER are requested to furnish their Variable & Fixed Cost on

monthly basis to NERLDC for calculation of loss incurred by utilities after grid

disturbance & grid incident, implementation of ancillary service, preparation of

various reports etcs. The data can be emailed to [email protected].

As on date, NEEPCO is furnishing the data on monthly basis except AGTPP

extension. OTPC, Palatana is only furnishing the Variable Cost on monthly basis.

All other generation utilities are requested to furnish the data.


NERLDC informed that only NEEPCO had given both the fixed and variable cost.

OTPC have furnished only the variable costbut the Annual Fixed cost is yet to be

given. NHPC has not furnished for both.

NERLDC also requested SLDCs of NER to furnish the Annual Fixed cost and variable

cost details of generators owned by state utilities, to NERLDC on regular basis.

The Sub-committee requested NHPC & OTPC & states of NER to furnish the same at the earliest.

Action: NHPC & OTPC & SLDCs.

D.20 Shortfall data in respect of Demand met(MW) [0800hrs & 1900/2000 hrs] & Energy met(MU)

NERLDC is preparing various reports on daily basis, for sending to Ministry and

other authorities, which contain Shortfall data in respect of Demand met & Energy

met. Assam, Meghalaya & Tripura are furnishing the MW shortfall data on daily

basis through their SLDCs. In respect of Energy shortfall for a day only Meghalaya is


27

furnishing the same. As a result we are computing the shortfall figures based on

statistics. These are creating confusion on some occasions. To avoid this it is

requested to the remaining beneficiaries to furnish the above data so that same can

be directly entered in the reports.

Time line for furnishing is as follows-

Demand met (MW) shortfall figures - 0900 Hrs for 0800 hrs data, 2100 hrs for

1900/2000 hrs data.

Energy met (MU) shortfall data - 0100 hrs for previous day.


NERLDC informed that various report on daily basis are prepared which are being

send to Ministry and other authorities. These reports are also referred by many

agency/authority to access the power position of NER constituents.

The reports prepared by NERLDC contains Shortfall of State at morning 08:00 Hrs &

Evening 19:00/20:00 Hrs in respect of Demand met and Shortfall in respect of

Energy met in a day. Assam/Tripura are furnishing the morning 08:00 Hrs &

Evening 19:00/20:00 Hrs shortfall data and only Meghalaya SLDC is furnishing the

Energy shortfall data on daily basis.Other States are not furnishing these operational

data.

Due to non-furnishing of data by the States to NELRDC. NERLDC is calculating

morning 08:00 Hrs & Evening 19:00/20:00 Hrs and Energy met shortfall based on

statistics.

The Sub-committee requested all SLDCs to furnish Demand met (MW) shortfall figures by 0900 Hrs for 0800 hrs data & by 2100 hrs for 1900/2000 hrs data and Energy met (MU) shortfall data - 0100 hrs for previous day.

D.21 Monthly Progress Report of Ongoing Projects

In 115th OCC Meeting of NERPC held on 24th November, 2015, it was decided that

furnishing of monthly progress report by utilities of NER would be reviewed on a

quarterly basis.

Latest status of furnishing of Monthly Progress Report of Ongoing Projects is as

follows:


28

Name of Constituent Latest Status Remarks

DoP, Ar. Pradesh Submitted for Nov’15

AEGCL Submitted for Nov’15

APGCL Submitted for Nov’15

MSPCL Submitted for Jan’16

MePTCL Submitted for Jun’15

MePGCL Not submitted

P&E Dept., Mizoram Not submitted

DoP, Nagaland Submitted for Sep’15

TSECL Submitted for Aug’15

POWERGRID Submitted for Jan’16

NEEPCO Submitted for Jan’16

NTPC Submitted for Dec’15

NHPC Not submitted

This is for information & necessary action please.

D.22 Up-loading of reports/information in NERLDC website as per regulations of CERC& CEA.

a. As per Clause No. 29.2 of Fees and Charges of RLDC and other related matter,

Regulations 2015, “Each RLDC shall submit its actual performance against each

of the key performance indicators to the Commission on annual basis as per the

format specified in Appendix V.”

Hon’ble CERC has identified 12 numbers of Key Performance Indicators (KPI). Out of

these, the following information related to KPI are to be periodically uploaded in

NERLDC website.

1. Interconnection meter error (Weekly) 2. Voltage Deviation Index of all 400 kV & above substation (Daily, Weekly &

Monthly)

3. Frequency Deviation Index (Daily, Weekly & Monthly) 4. Reporting of system reliability (Daily, Weekly & Monthly)


29

This reports/information will be uploaded in NERLDC website on daily, weekly, &

monthly basis w.e.f Mar16.

It is requested to POWERGRID (Bongaigaon, Balipara, Misa, Silchar, Biswanatth

Chariali), AEGCL (Azara), OTPC (Palatana), NEEPCO (Ranganadi), NTPC (BgTPP) &

MePTCL (Byrnihat) to furnish the hourly bus voltage data to NERLDC on daily basis

for calculation of Voltage Deviation Index.

b. As per Clause No. 5.5.1.b, 5.5.1.c & 5.5.2.a of Indian Electricity Grid Code

Regulations, 2010 by CEA, Daily, Weekly & Quarterly Report covering the

performance of NER is being uploaded in NERLDC website.

c. As per Clause No. 13.3 of Grid Standard Regulations, 2010 by CEA, a brief

preliminary grid disturbance report is being uploaded in NERLDC website.

d. Other reports such as Load Crash Reports (Event based), Grid Disturbance

analysis based on PMU (Monthly)is also being uploaded in NERLDC website.

e. Weekly Event Reports are being mailed to all the utilities for furnishing

information for root cause analysis & remedial measures to be taken.

f. Weather Warnings from IMD are mailed by Real Time Security Desk of NERLDC

in each shift to all the utilities.

g. Power Supply Position Report, Unit-wise Generation Report, Performance

Report, System Status Report are uploaded in NERLDC website on monthly

basis.

h. Quarterly Operational Feedback consisting of system constraint, performance of

grid, grid disturbances etcs are being sent to NLDC for submission to CTU, CEA

& CERC. However, the same can be accessed from NLDC website.


NERLDC informed that at present, SCADA data of 400 kV Azara (AEGCL) and 400 kV

Byrnihat (MePTCL) are not reporting correctly. Due to intermittency of SCADA data

from 400 kV substations of NER, it becomes difficult to prepare reports as per

directives of CERC. The constituents of NER were requested to collect and submit the

data of 400 kV substations to NERLDC as backup to SCADA data.

It was agreed upon.



30

ADDITIONAL AGENDA:

A. Sale of power, under requisition, over drawal & shortfall –

The matter was also discussed in earlier meetings. It has been observed that

contradictory actions are being taking place in the system creating real time problem

on some occasions. Constituents are requested to please look into the matter to avoid

complications. Moreover, breakup of shortfall figures which were requested may

please be furnished so that the same can be appraised to concerned authorities,

including MOP, accordingly.


DGM(SO), NERLDC stated that the States mainly Assam has been overdrawing from

the Grid on a sustained basis which needs to be corrected.

Assam and Meghalaya SLDCs informed that due to erratic real time data, SLDCs

cannot get the correct drawal figure from grid and at times real time data shows

underdrawal whereas it is overdrawal in actual practice.

It was decided that the matter should be discussed in NETST forum to address the

issue of real time visibility in SLDCs.

On an enquiry from Meghalaya regarding their shortage figure being depicted in daily

report, it was clarified that same was based on Meghalaya data only. Meghalaya was

advised to look into it and submit data in accordance with the philosophy being

followed.

The Sub-committee requested all constituents to furnish shortfall and breakup of the

same on regular basis and also requested all to avoid overdrawal when they are

either selling power or has gone for under requisition from ISGS.


B. Technical minimum of Palatana-

OTPC representative requested that Technical minimum of Palatana should be

agreed % of installed capacity of each unit (less normative auxiliary consumption)

and not on percentage of declared capacity.


31

They highlighted issues with their machines as below:

1. Gas Turbine Fuel mode change over from PM mode to PPM mode require set of

Gas Control valves position change over(not desirable).

2) NOX generation will be more than statutory environmental limit(50 PPM) in case

OTPC gas Turbines are operated below technical minimum load.

After discussion it was clarified that methodology being followed will continue to be in line with deliberation.

Date & Venue of next OCC meeting

It is proposed to hold the 119th OCC meeting of NERPC on first week of March,

2016. However, the exact date and venue will be intimated in due course.

The meeting ended with thanks to the Chair.

***********


32

Annexure-I

List of Participants in the 118th OCC Meetings held on 11/02/2016

SN Name & Designation Organization Contact No. No Representative Ar. Pradesh 1 Sh. T.N. Sarma, DGM, SLDC Assam 09435007369 2 Sh. J.K. Baishya, AGM Assam 09435041494 3 Sh. B.C. Borah, AGM,SLDC Assam 09435119248 4 Sh. K. Sarma, AGM, AEGCL Assam 09435013532 5 Sh. A.N. Dev Choudhury, AGM, APDCL Assam 09954055295 6 Sh. A. Kayina, MSPCL Manipur 08132823793 7 Sh. D. Theingam Thangal, MSPCL Manipur 08731923972 8 Sh. F.E Kharshiing, SE (SLDC) Meghalaya 09863066960 9 Sh. T. Gidon, EE, SLDC Meghalaya 09774479956 No Representative Mizoram - No Representative Nagaland No Representative Tripura

10 Sh. P. Kanungo, DGM (AM) PGCIL 09436302823 11 Sh. N.R. Paul, DGM NERLDC 09436302723 12 Sh. Anupam Kumar, Sr. Engineer NERLDC 09436335379 13 Sh. Rahul Chakrabarti, Sr. Manager NERLDC 09402507543 14 Sh. Ankit Jain, Engineer NERLDC 09436335381 No Representative NEEPCO

15 Sh. Smarajit Chakraborty, Mgr (O&M) NTPC 09435322591 No Representative ENICL -

16 Sh. MD Sajid Akhter, Manager (O&M) NHPC 09436678603 17 Sh. Thakor Prasad Pandey, DGM (O&M) OTPC 08794718423 18 Sh. P.K. Mishra, MS NERPC - 19 Sh. B. Lyngkhoi, Director/S.E (O) NERPC 09436163419 20 Sh. S.M. Aimol, DD/Ex. Engineer NERPC 08974002106

Stn A Stn B Stn A Stn B

132KV D/C RC Nagar-Agartala-I** 132 Double Circuit 8.384 ACSR PANTHER 600/1 400/1 300/1 400/1 70 55

132KV D/C RC Nagar-Agartala-II** 132 Double Circuit 8.384 ACSR PANTHER 600/1 400/1 300/1 400/1 70 55

132KV S/C Badarpur-Kolasib 132 Single Circuit 107.226 AAAC PANTHER 600/1 600/1 600/1 600/1 75 75 No replacement of CTs required132KV S/C Kolasib-Aizwal 132 Single Circuit 66.098 AAAC PANTHER 600/1 600/1 600/1 600/1 75 75 No replacement of CTs required132 KV S/C Badarpur - Khliehriat 132 Single Circuit 76.646 AAAC PANTHER 600/1 600/1 600/1 600/1 75 75 No replacement of CTs required

132 KV S/C Jiribam- Aizwal 132 Single Circuit 172.315 ACSR PANTHER 400/1 400/1 400/1 400/1 70 70 CT ratios need upgradation with 600/1 CTs at both ends of the line, in order to confirm to Dynamic Line ratings as per guidelines of NRCE (Total of 6 no. CTs will need to be replaced by POWERGRID). Replacement with higher capacity CTs will take at least 6 months.

132 KV S/C Jiribam-Haflong 132 Single Circuit 100.630 ACSR PANTHER 400/1 400/1 400/1 400/1 70 70 CT ratios need upgradation with 600/1 CTs at both ends of the line, in order to confirm to Dynamic Line ratings as per guidelines of NRCE (Total of 6 no. CTs will need to be replaced by POWERGRID). Replacement with higher capacity CTs will take at least 6 more months.

132KV S/C Khandong -Umrangso- Haflong 132 Single Circuit 63.166 ACSR PANTHER 300/1 400/1 300/1 400/1 55 55

CT ratios need upgradation with 600/1 CTs at Khandong and Umrangshu ends of 132 kV Khandong - Umrangshu lines and Umrangshu & Haflong ends of 132 kV Umrangshu - Haflong lines, in order to confirm to Dynamic Line ratings as per guidelines of NRCE (Total of 12 no. CTs will need to be replaced; 3 CTs at Khandong by NEEPCO; 3 CTs at Umrangshu end of 132 kV Umrangshu - Khandong by AEGCL; 3 CTs at Umrangshu end of 132 kV Umrangshu - Haflong line by AEGCL; 3 CTs a Haflong end of 132 kV Umrangshu - Haflong line by POWERGRID). AEGCL informed that LOA has been issued for CT ratio upgradation and replacement. AEGCL will further update status later. In Khandong side, tendering process is ongoing.

Name of the lineOperating

voltage (KV)

Tower Type Length KM)

Type of Conductor

Upgradation of conductors of these lines to HTLS conductors has been approved in 5th SCM of NER on 08.08.15. It is proposed to increase the CT ratios at both ends of this D/C to 800/1 each. (Total of 12 CTs will need to be replaced by POWERGRID). Replacement with higher capacity CTs will take at least 6 months.

CT Ratio at either end

(max)

CT Ratio at either end(adopted)

Maximum Loading Capacity

Present Loading

Capacity)Remarks

132kV S/C Kumarghat-R.C.Nagar 132 Single Circuit 104.020 ACSR PANTHER 600/1 600/1 600/1 600/1 75 75 No replacement of CTs required

132 KV S/C Loktak - Imphal-II 132 Single Circuit 35.040 ACSR PANTHER 400/1 600/1 400/1 600/1 75 75 CT ratios need upgradation with 600/1 CTs at Loktak end of the line, in order to confirm to Dynamic Line ratings as per guidelines of NRCE (Total of 3 no. CTs will need to be replaced by NHPC). NHPC has already procured the CTs for replacement. Expected to complete by April 2016.

132KV S/C Nirjuli-Ranganadi 132 Single Circuit 22.29 ACSR PANTHER 600/1 500/1 600/1 500/1 75 75 No replacement of CTs required

132kv Palatana-Surajmani Nagar 132 Double Circuit 35.00 Twin ACSR Moose 600/1 600/1 600/1 600/1 120 120 No replacement of CTs required

132 kV Doyang -- Dimapur I 132 Double Circuit 92.53 ACSR PANTHER 300/1 300/1 300/1 300/1

132 kV Doyang - Dimapur II 132 Double Circuit 92.53 ACSR PANTHER 300/1 300/1 300/1 300/1

Procurement and upgradation of CTs will take at least another 6 months.

ANNEXURE-D.2

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

1 220KV Misa-Mariani(old) line 7:00 to 15:00 Hr For facilitating mass replacement of defective insulator strings identified by PID

2 220KV Misa-Mariani(new) line 7:00 to 15:00 Hr For facilitating mass replacement of defective insulator strings identified by PID

3 132KV Silchar-Imphal-I 7:00 to 15:00 Hr For facilitating stringing of OPGW in the line

4 400KV Balipara-Biswanath Chariali-I along with Line Reactor 7:00 to 15:00 Hr For checking of remote operation & fixing alignment under NTAMC project

5 400KV Balipara-Biswanath Chariali-II along with Line Reactor 7:00 to 15:00 Hr For checking of remote operation & fixing alignment under NTAMC project

6 400KV Balipara-BiswanathChariali-III 7:00 to 15:00 Hr For checking of remote operation & fixing alignment under NTAMC project

7 400KV Balipara-BiswanathChariali-IV 7:00 to 15:00 Hr For checking of remote operation & fixing alignment under NTAMC project

8 400KV Balipara-Bongaigaon-I 8:00 to 10:00 Hr For checking of remote operation under NTAMC project

9 400KV Balipara-Bongaigaon-II 8:00 to 10:00 Hr For checking of remote operation under NTAMC project

PROPOSED SHUTDOWN OF ELEMENTS FOR 118th OCCM- BAR CHART

SN Name of ElementFeb/16 Mar'16

Time Purpose

1.TRANSMISSION LINES

10 400KV Balipara-Bongaigaon-III 10:00 to 12:00 Hr For checking of remote operation under NTAMC project

11 400KV Balipara-Bongaigaon-IV 10:00 to 12:00 Hr For checking of remote operation under NTAMC project

12 400KV Misa-Balipara-I 10:00 to 12:00 Hr For checking of remote operation under NTAMC project

13 400KV Misa-Balipara-II 10:00 to 12:00 Hr For checking of remote operation under NTAMC project

14 132KV RC Nagar-Agaratala-I 7:00 to 15:00 Hr For tightening of jumpers along the line

1 400/220KV, 315MVA ICT 10:00 to 10:45 Hr Changeover of units

2 400KV, 50MVAR Balipara-I Line Reactor 7:00 to 15:00 Hr AMP. Line will be required to be opened for 1/2 Hr during opening & restoration of Reactor

3 400KV, 50MVAR Balipara-II Line Reactor 7:00 to 15:00 Hr AMP. Line will be required to be opened for 1/2 Hr during opening & restoration of Reactor

4 400KV, 80MVAR Bus Recator-III 7:00 to 15:00 Hr For AMP

5 400KV, 50MVAR Bus Reactor-I 7:00 to 15:00 Hr For AMP

400kV Silchar SS

1 400KV ICT-I - Azara Tie Bay 7:00 to 15:00 Hr Tan Delta of CT, CB etc. Line & ICT will be in service

2 400KV , 63MVAR Bus Recator-I Main Bay 7:00 to 15:00 Hr Tan Delta, CT, Cb etc. Bus recator will remain in service thro' Tie Bay

3 400KV Pallatana-II Main Bay 7:00 to 15:00 Hr Tan Delta, CT, Cb etc. Line will remain in service thro' Tie Bay

4 7:00 to 15:00 Hr

AGTPP Gen may back down

2. SUBSTATION

400/220KV Bongaigaon Substation

Subject to availability of other reactors

4 400KV , 63MVAR Bus Reactor-II Main Bay 7:00 to 15:00 Hr to attend Oil leakage

5 63MVAR, 400KV Pallatana-I Line Reactor 7:00 to 15:00 Hr Tan Delta, CT, Cb etc. Line Recator will be out of service

6 400KV ICT-I Main Bay 7:00 to 15:00 Hr Tan Delta, CT, CB etc. ICT will remain in service

7 400KV Pallatana-I main bay 7:00 to 15:00 Hr Tan Delta, CT, CB etc. Line will remain in service thro Tie Bay

8 400KV Pallatana-II-ICT-II Tie Bay 7:00 to 15:00 Hr Tan Delta, CT, CB etc. ICT & Line will remain in service thro Main Bay

9 400/132KV ICT-II & 132KV Main Bus-II 7:00 to 15:00 Hr Tan Delta, CT, CB, isolator alignment etc. Other feeders shall will remain in service thro Main Bus-I

10 132KV Srikona-I Bay along with 132KV Main Bus-I 7:00 to 15:00 Hr Tan Delta, CT, CB, isolator alignment etc. Other feeders shall will remain in service thro Main Bus-II

1 400/220KV, 315 MVA ICT 7:00 to 15:00 Hr For checking of remote operation & fixing alignment under NTAMC project

BNCBus-2 7:00 to 15:00 Hr For New Bus reactor to Bus 2,All elemenst will remain in service.

220/132kV, 50MVA ICT of NEEPCO at Balipara 7:00 to 15:00 Hr

1 10 MVA ICT-I** 7:00 to 15:00 Hr Upgradation of 10 MVA ICT with 50 MVA

2 16MVA ICT-II Cont SD Upgradation of 16 MVA ICT with 50 MVA

3 132KV Main Bus 10:00 to 13:00 Hr For isolating ICT-II from Main Bus

132KV Nirjuli Substation

Subject to voltage condition

Balipara S/s

220 kV Samaguri-Sonabil-Balipara to remanl in operation

Subject to availiblity of 132kv BNC-BNC-D/C lines

Feb/16 Mar'16

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

1 220/132KV, 50MVA ICT-II 7:00 to 15:00 Hr AMP

AEGCL 220KV Grid sub-station, Nagajnka,Mariani

1 220KV, 12.5 MVA No.I 08:00 to 16:00 Hr Schedule maintenance

2 220KV, 12.5 MVA No.II 08:00 to 16:00 Hr Schedule maintenance

220 KV lines

1 Samaguri-Mariani II under Mariani 08:00 to 16:00 Hr Corridor cleaning, Jungle cutting

132KV Lines

1 LTPS-Mariani S/C 08:00 to 16:00 Hr Corridor cleaning, Jungle cutting

2 Jorhat-Mariani D/C 08:00 to 16:00 Hr Corridor cleaning, Jungle cutting

66KV Line

1 66KV Nazira-Mariani Line 08:00 to 16:00 Hr Corridor cleaning, Jungle cutting

NEEPCO1 400KV Ranganadi-BNC line-1 07:00 to 15:00 Hr (a) Replacement of Y-Phase 400KV line CVT of 400KV Ranganadi-BNC feeder-1.

SN Name of ElementFeb/16 Mar'16

Time Purpose

220/132KV Salakati Substation

1 400KV Ranganadi-BNC line-1 07:00 to 15:00 Hr (a) Replacement of Y-Phase 400KV line CVT of 400KV Ranganadi-BNC feeder-1. (b) Switching of 132KV feeders & units in double bus arrangement (c)

132 kV RHEP Bus 07:00 to 15:00 Hr

400KV Kukurmara(mirza) GSS, AEGCL1 400KV Bus-1 & 400 Bongaigaon Line 08:00 to 15:00 Hr Maintenance Purpose

2 400KV Transformer-2 (315MVA) 08:00 to 15:00 Hr Maintenance Purpose

3 220KV Sarusajai- Azara Line 1 08:00 to 15:00 Hr Maintenance Purpose

Subject to system condition

20 MW SUPPORT TO Arunachal,Support from Gohpur to Arunachal & subject to consent from Arunachal

NEEPCODHEP,Kopili, Khandong & AGTP

1 DHEP Unit#III 00:00 to 24:00 Hr APM

2 Kopili P.S. 00:00 to 24:00 Hr Repairing of outlet portal of Umrong Tunnel

3 Khandong Unit #I 00:00 to 24:00 Hr APM

4 AGTP HRSG # 4 00:00 to 24:00 Hr Expansion bellow shifting works

5 AGTP GT # 4 00:00 to 24:00 Hr Expansion bellow shifting works







MePTCL

Continouous S/D i.e. 8 days from 26.03.16 to 02.04.16

Continouous Shutdown for 60(sixty days i.e. from 25.02.16 to 24.04.2016

AFTER RESTORATION OF KOPILI PH

MePTCL1 220KV Byrnihat-Misa D/C line 07:00 to 15:00 Hr Maintenance works & Jungle clearance

AEGCL1 220KV Sarusajai-Mirza II 09:00 to 15:00 Hr For conductor repairing

2 220KV Mirza-Boko 09:00 to 15:00 Hr For maintenance, jungle cutting etc.

3 220KV Mirza-Agia 09:00 to 15:00 Hr For maintenance, jungle cutting etc.

4 220 kV Agia-Boko 08:00 to 17:00 Hrs For maintenance, jungle cutting etc.

5 220 kV Tinsukia-Kathalguri-D/C 08:00 to 16:00 Hr Maintenance works

6 220 kV Samaguri-Balipara 08:00 to 16:00 Hr For maintenance, jungle cutting etc.

ER

1 400KV Balipara-Bongaigaon-II 07:00 to 15:00 Hr Insulator replacement work

NHPC

UNIT-2 00:00 to 24:00 Hr AMP

** Already approved in 117th OCCM

(As per Recommendations of CEA's Enquiry Committee on Grid Disturbance, and Protection Audit by M/S Tractebel)

PlantUnit No.Date :

Time-BlockActive Power in MW

(+/- = Injection/Withdrawal)

Active Power in MVAR (+/- = Injection/Withdrawal)

Terminal Voltage of Generator in kV

Remarks: Minimum resolution for furnishing the data should be Hourly Time Blocks

Reactive Power Absorption of Generators ANNEXURE-D.3

1 2 3 4

Apr-13 May-13 Jun-13 Apr-14 May-14 Jun-14 Apr-15 May-15 Jun-152013-14 Average

2014-15 Average

2015-16 Average

Projected Demand for

(Apr 2016 to Jun 2016) before

normalization Arunachal Pradesh 95 100 106 104 111 110 114 109 108 100 108 110 119

Assam 1,012 1,102 1,118 1,230 1,212 1,215 1,282 1,260 1,324 1,077 1,219 1,289 1,200

Manipur 98 113 116 112 109 117 148 153 147 109 113 149 164

Meghalaya 273 286 271 272 296 289 312 295 295 277 286 301 278

119 As per Data given by Arunachal Pradesh

1250 As per Data given by Assam and 118th OCC

164 As per Data given by Manipur

278 As per Data given by Meghalaya

Mizoram 64 62 68 76 73 74 80 84 81 65 74 82 89 89 As per Data given by Mizoram

Nagaland 80 100 96 102 104 111 112 112 120 92 106 115 114 114 As per Data given by Nagaland

Tripura 206 212 220 246 233 230 238 254 249 213 236 247 258 258 As per Data given by Tripura

N. Eastern Region 1,718 1,810 1,900 2,045 1,986 1,998 2,114 2,185 2,190

Notes1. Projections are based on the past 3 years' monthly Peak Demand Met data available on the website of CEA2. The above projections are being done for financial year 2016-2017 (Q1) i.e April 2016 to June 20163. Projections are being done based on the forecast function available in MS Office Excel4. In case of the re-organized states of Andhra Pradesh and Telangana Maximum Demand is divided in the ratio 53.89% for Telangana and 46.11% for Andhra Pradesh for FY 2012-13 and 2013-14. This is as per letter No.CE/COMML./APPCC/DE-COMML/POC-DATA-15-16/D.No/15 dtd. 09.10.15 as received from APTRANSCO.4. CEA Reports can be accessed from the following links:

http://cea.nic.in/reports/monthly/powersupply/2013/psp_peak-04.pdfhttp://cea.nic.in/reports/monthly/powersupply/2013/psp_peak-05.pdfhttp://cea.nic.in/reports/monthly/powersupply/2013/psp_peak-06.pdfhttp://cea.nic.in/reports/monthly/powersupply/2014/psp_peak-04.pdfhttp://cea.nic.in/reports/monthly/powersupply/2014/psp_peak-05.pdfhttp://cea.nic.in/reports/monthly/powersupply/2014/psp_peak-06.pdfhttp://cea.nic.in/reports/monthly/powersupply/2015/psp_peak-04.pdfhttp://cea.nic.in/reports/monthly/powersupply/2015/psp_peak-05.pdfhttp://cea.nic.in/reports/monthly/powersupply/2015/psp_peak-06.pdf

DEMAND FORECAST USING PAST 3 YEARS DATA (April 2016 - June 2016)

Data given by

DICsComments

2013-14 2014-15 2015-16

Sl.

No.Entities Region

Projections based

on 3 Years DataBus Name Unit No. Installed Capacity Gen. considered Sub Total Bus Name Unit No. Installed Capacity Gen. considered Sub Total TOTAL

Comments From DICs /Others

(if any)

Figure as per

Comments/PoC Data

Projected Generation before

normalization w.r.t projected All In

Peak Demand

(MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW)

1 AGTPP, NEEPCO NER 82 82 107 78

2 AGTPP Extn. NER 46 44

3 Doyang, NEEPCO NER 44 44 42 42

4 Kopili, NEEPCO NER 146 146 120 90

5 Khandong, NEEPCO NER 38 38 30 30

6 Ranganadi, NEEPCO NER 430 430 407 401

7 Kathalguri NER 224 224 231 231

8 Loktak, NHPC NER 98 98 103

9 Palatana GBPP NER 478 478As per forecasted generation

given by OTPC478 478

10 Arunachal Pradesh NER 0 0 0

11 Assam NER 356 356Forecasted generation as

given by Assam246 246

12 Manipur NER 0 0 0

13 Meghalaya NER 158 Meghalaya Power Limited 2 45 20 20 178Forecasted generation as

given by Meghalaya271 271

14 Nagaland NER 16 16Forecasted Maximum injection

as given by Nagaland21 21

15 Tripura NER 107 107Forecasted Maximum injection

as given by Tripura98 98

16 Mizoram NER 3 3Forecasted generation as

given by Mizoram6 6

TOTAL 2180 20 0 2200 2201

Note:

1. Projections are based on monthly maximum injection in the last 3 years from actual metered data.

2. Generation forecast has been done based on the following criteria

(i) If there is an increasing trend then last year average generation has been considered

(ii) Otherwise average of past three year average generation has been considered

3. In case of new generators where past data was not available following has been assumed

(i) 1 plf for hydro generators

(ii) 0.7 plf for thermal generators.

(iii) 0.3 plf for gas stations

4. In case of the re-organized states of Andhra Pradesh and Telangana Generation is divided in the ratio 53.89% for Telangana and 46.11% for Andhra Pradesh for FY 2012-13 and 2013-14.

This is as per letter No.CE/COMML./APPCC/DE-COMML/POC-DATA-15-16/D.No/15 dtd. 09.10.15 as received from APTRANSCO.

Generation Projection (April'16 - June'16)

Generation declared Commercial from 1st July '15 to 31st Decembe'15

Generation declared/expected to be declared Commercial from 1st Jan '16 to 31st Mar'16

As per forecasted generation

given by NEEPCO

& 118th OCC Comments

Senario : February 2016 09-Feb-16

Sl. No. SubstationVoltage Ratio

(kV)

Transformer

No.

Capacity

in MVA

Controlled

Bus

Tap Step

(%)

Total

Tap

Positions

Nominal

Tap

Present

Tap

Optimised Tap

Changer

Position

Peak

Nominal

Taps

Present

Tap setting

After

Optimisaton

After

Optimisaton

1 Balipara 400/220 1 315 400kV 1.25 17 9 9 422 417 413 407 NO+1 (10)

220/132 2 50 132kV 1.25 17 9 9 140 140 136 133 NO+2 (11)

220/132 3 50 132kV 1.25 17 9 9 NO+2 (11)

2 Bongaigaon 400/220 1 315 400kV 1.25 17 9 12 419 419 416 412 NO+3 (12)

3 Salakati 220/132 1 50 132 kV 1.25 17 13 13 142 138 137 133 NO (13)

220/132 2 50 132 kV 1.25 17 13 16 NO+3 (16)

4 Misa 400/220 1 315 400kV 1.25 17 9 5 423 417 410 404 NO-4 (5)

400/220 2 315 400kV 1.25 17 9 5 NO-4 (5)

5 RHEP 400/132 1 360 400 kV 2.5 17 9 9 424 419 414 409 NO+2 (11)

400/132 2 360 400 kV 2.5 17 9 9 NO+2 (11)

6 Azara 400/220 1 315 400kV 1.25 17 9 8 421 419 416 410 NO-1 (8)

400/220 2 315 400kV 1.25 17 9 8 NO-1 (8)

7

Biswanath Chariali

(PG) 400/132 1 200 400 kV 1.25 17 9 8 425 420 415 410 NO-1 (8)

400/132 2 200 400 kV 1.25 17 9 8 NO-1 (8)

8 Silchar 400/132 1 200 400 kV 1.25 17 9 9 419 421 417 409 NO (9)

400/132 2 200 400 kV 1.25 17 9 9 NO (9)

9 Byrnihat 400/220 1 315 400 kV 1.25 17 9 9 426 428 426 420 NO+2 (11)

400/220 2 315 400 kV 1.25 17 9 9 NO+2 (11)

220/132 5083/1 160 132 kV 1.25 17 9 9 140 141 141 141 NO-1 (8)

220/133 5083/1 160 132 kV 1.25 17 9 9 NO-1 (8)

10 Palatana 400/132 1 125 132 kV 1.25 17 9 9 140 141 137 134 NO+2 (11)

Transformer Tap Optimisation Study

Voltage Profile

Off-Peak

Note : a) NO indicates Nominal Tap position, b) NO-1 when HV bus is controlled bus, indicates transferring MVAR from HV bus to LV bus to reduce voltage of the HV bus and increase voltage

of LV bus

Scatter Plots(October 2015 to January 2016)

400/220 kV Bongaigaon (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Bon 400/220 kV ICT Oct

Bon 400/220 kV ICT Nov

Bon 400/220 kV ICT Dec

400/220 kV Bongaigaon (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Bon 400/220 kV ICT Jan16

400/220 kV Balipara (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Bal 400/220 kV ICT Oct

Bal 400/220 kV ICT Nov

Bal 400/220 kV ICT Dec

400/220 kV Balipara (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Bal 400/220 kV ICT Jan16

400/220 kV Misa (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Misa 400/220 kV ICT Oct

Misa 400/220 kV ICT Nov

Misa400/220 kV ICT Dec

400/220 kV Misa (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

198.00 203.00 208.00 213.00 218.00 223.00 228.00 233.00 238.00

Misal 400/220 kV ICT Jan16

400/220 kV Palatana (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Palatana 400/132 kV ICT Oct

Palatana 400/132 kV ICT Nov

Palatana 400/132 kV ICT Dec

400/220 kV Palatana (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Palatana 400/220 kV ICTJan16

400/220 kV Silchar (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Silchar 400/132 kV ICT Oct

Silchar 400/132 kV ICTNov

Silchar 400/132 kV ICTDec

400/220 kV Silchar (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Silchar 400/220 kV ICTJan16

400/132 kV Ranganadi (Oct-Dec 2015)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Ranganadi 400/132 kV ICT Oct

Ranganadi 400/132 kV ICT Nov

Ranganadi 400/132 kV ICT Dec

400/132 kV Ranganadi (Jan 2016)

380.00

390.00

400.00

410.00

420.00

430.00

440.00

120.00 125.00 130.00 135.00 140.00 145.00

Ranganadi 400/220 kV ICTJan16

North Eastern Regional Power Committee MINUTES OF THE … OCC Minutes... · 2019-02-01 · Minutes...

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